If you stare at one of the second digits in the center, say the Mountain Time seconds digit, its interesting to note whether you're peripheral vision does or do

If you stare at one of the second digits in the center, say the Mountain Time seconds digit, its interesting to note whether you're peripheral vision does or does not detect the other digits changing. For me, it seems number dependent: I see 1-2-3, and 7-8 but the other transitions appear static!